I'll be the first to admit that I'm not a Linux expert, but I believe the DCSS doesn't have to be at the top of the guest's memory. As long as you r Linux guest can address the DCSS you should be OK. I'm guessing that add ing the mem=529m to your parameter file and not rebooting the linux guest m ay be the reason you couldn't read the DCSS. When you changed your guest's size
and rebooted you picked up the mem=529m parameter. On Tue, 16 Oct 2007 10:33:47 -0500, RPN01 <[EMAIL PROTECTED]> wrote: >I hate it when I think of an answer my own questions as I type them, and >then hit send anyway. > >Changing the size of the guest from 512m to 528m and restarting solved t he >problem. The segment does indeed have to match the top of the guest¹s >memory. > >-- > .~. Robert P. Nix Mayo Foundation > /V\ RO-OE-5-55 200 First Street SW > / ( ) \ 507-284-0844 Rochester, MN 55905 >^^-^^ ----- >"In theory, theory and practice are the same, but ³Join the story. .. >Ride Ural.² > in practice, theory and practice are different." > > >------ Forwarded Message >I¹m in the process of installing Omegamon XE for z/VM and Linux, and I ¹ve >gotten to the point of defining the DCSS to the linux guest serving as t he >monitor collection agent. > >I defined the Linux guest having 512m of memory. I defined the perfout d css >with ³DEFSEG 21000-210FF SN², which, I think, should be from 528M 529M. I >added ³mem=768m² to the zipl parameter line and reran mkinitrd and zipl. > >I did the ³modprobe dcssblk² to install the driver. I then did ³ec ho perfout >> /sys/devices/dcssblk/add², and the response is as follows: > >tvmpzl01:/sys/devices/dcssblk # echo perfout > add >-bash: echo: write error: Numerical result out of range > >Obviously, I¹ve missed something. Does the segment need to be immediat ely >adjacent to the top of the guest¹s virtual memory? Or can the definiti on >leave some space between the two, as above? What other problems can be >encountered? The 2.6 device drivers manual documents the dcssblk driver, but >includes no indication of what errors can be encountered or what message s >might be generated. > >Any help, or nudges in the right direction, would be appreciated. > >
